TUNGSTEN SULFIDE

Synonym(s):Tungsten disulfide;Tungsten sulfide;Tungsten sulphide;Tungsten(IV) sulfide;WS₂ flakes

CAS NO.：12138-09-9
Empirical Formula: S2W
Molecular Weight: 247.97
MDL number: MFCD00011467
EINECS: 235-243-3
SAFETY DATA SHEET (SDS)
Update Date: 2024-10-30 18:52:02

What is TUNGSTEN SULFIDE?

Description

Few-layer?tungsten disulfide (WS2) film has a 2D-layered structure with a narrow indirect bandgap of of 1.35 eV. In contrast, the monolayer film possesses a direct bandgap of 2.1 eV.

What are the applications of Application

Due to its distinctive electron configuration and high specific surface area, few-layer tungsten disulfide nanosheets have potential applications in electrodes and energy storage devices, supercapacitors, and photoelectrochemical cells as a catalyst for hydrogen evolution reactions (HERs). With?tunable electromagnetic absorption, it has practical applications?against electromagnetic pollution. WS₂?is also a great potential candidate in photothermal therapy for the ablation of cancer cells, when NIR light is absorbed and converted into heat.

Synthesis

High-quality tungsten disulfide monolayer?films?are grown directly on the substrates (sapphire) by? the chemical vapour deposition (CVD) method.

Preparation

Synthetic?- Chemical Vapour Transport (CVT)

Chemical properties

Grayish-black solid. Mp above 1480C, can lubricate at temperatures above 2400F (1316C). Attacked by fluorine and hot sulfuric and hydrogen fluoride.

The Uses of TUNGSTEN SULFIDE

Tungsten sulfide is used as a component of catalysts for hydrotreating of crude oil, hydrodesulfurization and hydrodenitrification reactions. It finds application as solid-state secondary lithium battery cathodes and other electrochemical devices. It is found that it forms inorganic nanotubes, which is better reinforcing agents than carbon nanotubes. Tungsten sulfide addition to epoxy resin improves adhesion, fracture toughness and strain energy release rate.

The Uses of TUNGSTEN SULFIDE

Tungsten disulfide (WS2) is used as a solid lubricant that can withstand high temperatures. It is also used as a spray lubricant.

The Uses of TUNGSTEN SULFIDE

Tungsten sulfide possesses a pseudo 2 dimensional structure with applications in the Petrochemical industry as a desulfurization catalyst. Tungsten Sulfide nanoparticles have drawn research interest due to their potential in solid-state lubricants; coatings and photocatalysts.

What are the applications of Application

Tungsten(IV) sulfide is a component of catalysts and batteries

Definition

ChEBI: Tungsten disulfide is a sulfide salt.

Flammability and Explosibility

Not classified

Properties of TUNGSTEN SULFIDE

Melting point:	1480 °C
Density	7.5 g/mL at 25 °C(lit.)
RTECS	YO7716000
solubility	insoluble in H2O, HCl, alkaline solutions
form	powder
Specific Gravity	7.5
color	Dark gray
Water Solubility	Slightly soluble in water.
Exposure limits	ACGIH: TWA 3 mg/m3 NIOSH: TWA 5 mg/m3; STEL 10 mg/m3
CAS DataBase Reference	12138-09-9(CAS DataBase Reference)
EPA Substance Registry System	Tungsten sulfide (WS2) (12138-09-9)
Bandgap	1.4 - 2.01 eV
Electronic properties	2D semiconductor

Safety information for TUNGSTEN SULFIDE

Signal word	Warning
Pictogram(s)	Exclamation Mark Irritant GHS07
GHS Hazard Statements	H315:Skin corrosion/irritation H319:Serious eye damage/eye irritation H335:Specific target organ toxicity, single exposure;Respiratory tract irritation
Precautionary Statement Codes	P261:Avoid breathing dust/fume/gas/mist/vapours/spray. P305+P351+P338:IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continuerinsing.